The broken bag of composite packaging bag is an important factor affecting the suitability of packaging, which determines whether the packaging bag can be used for product packaging. There are many factors that affect the breakage of composite packaging bags, and they will be analyzed from four aspects below.
1. Peel strength of composite bag
If the peel strength of the composite bag is too low, it cannot meet the requirement of multi-layer composite materials to be stressed at the same time, resulting in the force not being well dispersed, and the bag will be broken during the drop process. In addition, in high-temperature retort bags, due to the poor heat resistance of some adhesives, mainly in some complex structures (such as BOPAl5/Al7/CPP70), when high-temperature retort, it will also cause cracks at the sealing edge. delamination of the composite film.
2. In terms of bag making process
The temperature of the compound bag making bag is too high, which causes the performance of the heat-sealing material at the heat-sealing part to decline, which affects the broken bag; the pressure of the bag-making is too high, causing the heat-sealing material at the heat-sealing part to be extruded, and the heat-sealing material at the door to be sealed Reduced, thus causing the bag to break when it falls. If the heat-sealing strip of the bag is too sharp, it will also damage the heat-cut edge of the bag, resulting in bag breakage.
3. Composite bag materials
The material should have some thickness. If the thickness is insufficient, the strength of the composite bag will be insufficient, resulting in the problem of broken bags: pay attention to the addition of recycled materials in the material, and the recycled materials will be reduced in all aspects. If too much is added, the strength of the composite bag will be insufficient, resulting in Broken bag. During the manufacturing process of PE film, LLDPE and mPE are added to increase the strength and flexibility of PE, thereby reducing broken bags. If the packaging is used in a low-temperature freezing environment, low-temperature-resistant packaging materials (such as BOPA) should be used to produce composite films, otherwise it will cause brittle cracking of the composite bag in a low-temperature freezing environment.
4. Other aspects of composite bags
When packing some heavy packaging or powder items such as salt, washing powder, etc., after filling such items and before heat sealing, the air in the bag should be discharged to reduce the force on the packaging bag wall and allow the solid The object is directly stressed to reduce the damage of the bag.